Three-position operating mechanism



O. S. FIELD. THREE POSITION OPERATING MECHANISM.

APPLICATION FILED JULY 6.1918.

Patented July 4, 1922.

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INVENTOH 0. S. FIELD. THREE POSITION OPERATING MECHANISM.

APPLICATION FILED .IULY 6,19I8- Patented July 4, 1922'.

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O. S. FIELDL THREE POSITION OPERATING MECHANISM. APPLICATION FILED JULY 5,1918.

1,421,769, Patented Jill 4, 1922.

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OSCAR S. FIELD, 01F ROSELLE, NEW JERSEY, ASSIGNOR T0 HALL SWITCH 8t SIGNAL 00.,

A. CORPORATION OF MAINE.

'rnn-rosrrron OPERATING MECHANISM.

trainee.

Specification of Letters Patent.

- Patented July 4,1922.

Application filed July 6, 1918. Serial No. 243,654.

subject of the King of Great Britain, and

a resident of the town of Roselle, county of Union, and State of NewJersey, have invented certain new and useful Improvements in ThreePosition' Operating Mechanisms, of which the following is a specification.

.This invention relates to certain new and useful improvements in three position operating mechanisms.

One object of the invention is to provide a mechanism which will operate a moving member'to three definite positions.

Another object is to provide means whereby the operation of the mechanism is dead beat in all three positions.

A further object of the invention is to so construct the mechanism as to reduce the possibility of failure to a minimum.

Other and further objects will beapparent from the following description and the appended claims.

In Figure 1 is showna side elevation of the mechanism in the deenergized and first position.

Figure 2 is a side elevation showing the mechanism in the second position.

Figure 3 is a side elevation showing the -mechanism in the third position.

Figure 4 is a section taken through 0-1; of Figure 1.

Figure 5 is a mec anism.

Figure 6 is a circuit diagrammatically showing how. the mechanism may be controlled to give the desired operation.

Referring to the figures and more specifically to Figures 1 and 4, there is provided a supporting member 1 adapted to carry electromagnets 2 and 3 provided with pole pieces 4 and 5 having stop pins 6 and 7 mounted thereon to prevent the respective armatures 8 and 9 from coming in contact with the pole pieces 4 and 5. The supporting member 1 is further adapted to carry bearings of low relative friction such as in ball bearings shown at 10 and 11. Journeled in these hearings is a shaft 12 to which is rigidly attached member 13 by means of the pin {15. This member 13 is adapted to carry armature 8 and is further provided with an extending arm 14 having an enlarged end 15 which is provided with color longitudinal section through, a li ht signal showing one adaptation of the spectacle glass 16, 17 and 18. The member 13 is normally held by gravity in the posit1on shown in Figure 1 against the projecting arm 19 on supporting member 1. The member 13 is further provided with bosses 20 and 21. A second member 22 is provided with bosses 23 and 24 which are adapted to freely rotate about the spindle 12 and are held in position by means of the coacting bosses 20 and 21 in such a manner as to'prevent member 22 from coming into contact with the stationary supporting member lor the bearings 10 and 11. This member 22 is adapted to carry armature 7 and is further provided with projections 26 and 27 which are normally held in engagement by gravity with the underside of member 13 as shown in Figure 1. A metal stop 28 is mounted on the supporting member 1 and insulated therefrom by means of insulation 29, being so placed that it will restrict the movement of armature 9 when the magnet 3 is energized.

In Figure 6 is diagrammatically shown a three position relay 30 of any well-known type. This relay is shown in the deenergized position with its contact fingers 31 and 32 in a neutral position. Upon energization of the relay in one direction the contact fingers 31 and 32 will move to one side, finger 32 closing its contact 33. and upon 4 being energized in the reverse direction the fingers will move in the reverse direction to close contacts 34 and 35. The operation of the mechanism is as follows:-

I Upon relay 30 being energized to close contact 33 energy will pass from source of energy 36 through Wire 37, coil .3, Wire 38, wire 39, contact 33. contact finger 32, wire 40. wire 41. back to source of energy. This will energize electromagnet 3 causing the same to pull its armature 9 in a downward direction. This movement of armature 9 will cause projections 26 and 27 to push upwardly on the underside of member 13 therebv causing this member to rotate aboutthe shaft 12 rotating the shaft in its bearings 10 and 11 and raising the arm 14 to the position shown in Figure 2 thereby displacing the spectacle 16 and bringing spectacle 17 to the axial center previously occupied by spectacle 16. At the completion of this movement armature 9 will strike metallic stop 28 which will prevent further movement.

From the above it will be 'seen that the 45 2 will become energized causing the completion of the movement.

mechanism has operated to its second position and has'closed electrical contact between armature-9 and metallic stop I 28. Should the three position relay now be reversed contact fingers. 31" and 32 will be caused to come. in contact with their respective contacts 34 and 35. Armature 9 bedirectly ing in itsenergized position, we have now closed a'circuit passing from source of en ergy" 36 through wire 37, metallic stop 28, armature 9, wire 42, coil of electromagnet 2, wire 43, contact 34, contact fin er 31, wire 41 back'to source of energy. 'lhis will energize magnet 2 and armature 8 having by the" previous movement of armature 9 been raised within the influences of the field magnet 2 will be attracted by this magnet causing member 13- to again move about its pivotal point raising arm 14 to position shown in F igure 3, thereby displacing spectacle 17 and placing spectacle 18 in the axial center originally occupied by spectacle 17. At the completion of this movement arm 14 will strike face 44 of supporting member 1 thereby stopping its movement. It will be seen that during .this operation armature 9 has not moved and that member 13 has moved awaty from the projections 26 and 27 the shat 12 rotating freely in the .bosses 23 and 24.

'Should the relay 30 now be deenergized the circuits to coils 2 and 3 would be opened thereby deenergizing both these magnets whereupon arm 14' will drop due to the action of gravity until member 13 engages with projections 26 and 27 when it willin its continued downward movement force these downward and raise armature 9 to its original or deenergized position as shown in Figure 1. r I

It will be seen that should the relay 30 be energized to close its contacts 34 and 35 that magnet 3 will first be energized causing the first. movement of arm 14 and upon completion of this movement magnet From the above description it is obvious that by controlling three position relay 30 any combination of movements of arm 14 may be obtained in any desired sequence. It will further be noted that on account of members 13 and 22 being mounted upon the same shaft 12 that the friction which tends to prevent the return .of the arm 14 to its deenergized position is only that due to the bearings 10 and 11 which may be reduced to a minimum. By mounting the members 22 and 13 in this manner instead of mounting the same in different bearings we have materially reduced the friction tending -to hold the mechanism in its energized position -without departing from the spirit of the invention.

Whatl claim is 1. In a three position operating mechanism, two electromagnets, coacting armatures for said electromagnets, a movable element controlled by said armaturesand biased to a neutral position, means whereby upon the energization of one of said electromagnets both armatures will be caused to move in unison to operate themovable'element to one position, and to bring one of said armatures'into operative relation with the other electromagnet,'means upon the movement of the Y armatures for conditioning the circuit of said other electromagnet so that said electromagnet may be energized, and means whereby upon energizationof said other electromagnet only one armature will be caused to move to operate the movable element to another position.

2. In a three position operatingmechanism, two electromagnets, coacting armatures for said electromagnets, a movable element controlled by said armatures and biased to a neutral position, means whereby upon the energization of one of said electromagnets both armatures will be caused to move in unison to operate the movable element to one position, means upon the movement of the armatures for conditioning the circuit of the other electromagnet so that said electrom agnet may beienergized, and means whereby upon energization of .said other electromagnet only one armature will be' caused In testimony whereof I have signed my name to this specification.

OSCAR s. FIELD.- 

